1389632725 has 12 divisors (see below), whose sum is σ = 1855694596. Its totient is φ = 1026190080.

The previous prime is 1389632711. The next prime is 1389632731. The reversal of 1389632725 is 5272369831.

It can be written as a sum of positive squares in 6 ways, for example, as 128459556 + 1261173169 = 11334^2 + 35513^2 .

It is not a de Polignac number, because 1389632725 - 2⁵ = 1389632693 is a prime.

It is a super-2 number, since 2×1389632725² = 3862158220781851250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2137572 + ... + 2138221.

Almost surely, 2^1389632725 is an apocalyptic number.

It is an amenable number.

1389632725 is a deficient number, since it is larger than the sum of its proper divisors (466061871).

1389632725 is a wasteful number, since it uses less digits than its factorization.

1389632725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4275816 (or 4275811 counting only the distinct ones).

The product of its digits is 544320, while the sum is 46.

The square root of 1389632725 is about 37277.7778978308. Note that the first 3 decimals coincide. The cubic root of 1389632725 is about 1115.9207272841.

The spelling of 1389632725 in words is "one billion, three hundred eighty-nine million, six hundred thirty-two thousand, seven hundred twenty-five".